Apparatus for bending pipes.



C. S. RYERSON.

APPARATUS FOR BENDING PIPES.

APPLICATION. FILED MAR. 28. 19m

Patented se t. 18, 1917.

2 SHEETSSHEET 1.

VB INVENTOH m wi -Me BY W ATTO/PA/Ey "F'l -III- C. S. RYERSON.

APPARATUS FOR BENDING PIPES. APPLICATION FILE-D MAR. 28. 1912.

1,240,605. Patented Sept. 18,1917.

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W.Q-5 Lw w Z K g WM BY 'TTORIVEY CHARLES S. RYERSON, OF DETROIT, MICHIGAN.

APPARATUS FOR BENDING PIPES.

Application filed March 28, 1917.

'1 all whom it may concern:

Be it known that I, CHARLES S. RYnRsoN, a citizen of the United States, residing at Detroit, county of lVayne, State of Michigan, have invented a certain new and useful Improvement in Apparatus for Bending Pipes, and declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

This invention relates to apparatus for bending pipes, or tubing, and has for its object an improved construction embodying comparatively few parts and easily portable, whereby such bending may be accomplished easily and efiiciently.

In the drawings:

Figure I is a side elevation of my improved device, with a section of pipe shown in position therein.

Fig. II is an end elevational view, the

i pipe being shown in position therein.

Fig. III is an end elevation, partly in section, of the frame of the device alone.

Fig. IV is a fragmentary plan view of the end of the frame from which the floor has been cut away to permit the swing of the pipe bending member.

Fig. V is a side elevation of the pipe-engaging segment removed from the frame.

Fig. VI is an end view of this segment.

Fig. VII is a sectional view of the pipeengaging segment, along the line 50, of Fig. V.

Fig. VIII is a side elevational view of a modified form of segment member, adapted especially for handling the ends of threaded pipe or bends with an especially short radius.

Fig. IX is an end view of this modified form of segment.

A represents a board or other suitable base, to which is fixed, by screws or otherwise, the bed-plate B of the frame C, between whose constituent side pieces, extends a central open space, in which are slidably journaled, underneath the inturned top edges D of the frame, the trunnionsE of the pipe-engaging segment member F. As shown in Fig. IV, the floor or bed-plate B of the frame is preferably cut away somewhat as at B to permit the lower end of the pipe-engaging segment member to swing Specification of Letters Patent.

Patented SeptJS, 1917.

Serial No. 157,877.

freely. This consists of a lower pipe jaw G, which is adapted to engage about half way around the inserted section of pipe H, which rests upon the floor or bed-plate B. With the pipe in position through the jaw portion G of the se ment, the several members occupy the position shown in Fig. I. Upon the manual actuation ofthe lever L, however, the spring-held deg K engages in the teeth of the ratchet member M, tending to rotate the entire segment piece F about its trunnions E as a horizontally moving center, and consequently to roll more of the curved peripheral edge N of the segment against the pipe H. This of course can only be brought about by the yielding of the pipe to the bending influence thus exerted, since its free end is held from swinging downwardly by the presence of the bed-plate of the frame. The semi-circular jaw portion G, of course, holds the pipe firmly against yielding in the other direction, and the consequence is that the desired degree of curvature is imparted to the pipe, after which it is easily removed. For relatively slight curvature, only a slight actuation of the lever L is required, and in fact I desire it clearly understood as within the scope of my invention to have the actuating lever rigid with respect to the pipe-engaging segment, instead of journaled about its trunnion center, thus doing away, under some circumstances, as for example a slight degree of bending or a very soft pipe, with the ratchet and dog members. But where an or 90 degree curve is desired, several notches of the ratchet M may have to be successively engaged by the dog K. As the segment is turned about its rotative axis, the overengaging top edges D of the frame hold the trunnion ends E down and yet permit them to slide along their under surface, lengthwise of the frame. The curved periphery N of the segment piece receives the pipe, as it is bent theretoward, into its troughed portion, but the pipe is in no other way moved with respect to the frame 0; in other words it is not wiped or drawn along the frame as the bending process goes on; on the contrary, the curved surface of the segment rolls onto and in contact with it, and since the guiding influence of the top edges of the trough N becomes effective as soon as the bending process is begun, the pipe is held thereby, as well asby the gripping of the jaws G, against slipping out through the open side of the jaw. The trough or peripheral groove N also serves to hold the pipe against lateral expansion and consequent flattening as it is being bent about the segments periphery.

In Figs. VIII and IX, I have shown a modified form of segment member in which the pipe-engaging portion consists of a completely inclosed circular portion R, instead of the jaw G of the first type. It will be noted that in this form the curved peripheral edge of the segment is much smaller. This form of device is especially adapted for handling the end of a pipe and for avoiding the mutilation of the threading frequently there present, and is adapted,because of its short periphery, to impart a bend of unusually small radius of the pipe thus near one end. The downwardly holding influence of the overengaging frame edges D on the trunnion E is the same in each form, however.

hat I claim is 1* 1. In combination with an open-ended frame member, whose side portions are provided with overengaging upper edges, apressing segment having trunnion portions adapted to engage the under faces of said overengaging edges and to be movable lengthwise thereof when the segment is rotatively actuated against an attached length of pipe interposed between its periphery and the floor of the frame member.

2. The combination of a frame member adapted to support an inserted length of pipe, a segment member rotatable therewithin and with its aXis of rotation movable lengthwise thereof in a line parallel to the aXis of said pipe, and means for rotating said segment, thereby drawing the pipe .about the curved periphery of said segment.

3. In combination with a frame, a segment member provided with a pipe-engaging projection adapted to engage a length of pipe inserted in said frame and to be peripherally rocked thereagainst, said segmentv member having laterally projecting trunnion portions adapted to slidably engage complementary overengaging portions of the frame, whereby the aXis of rotation of the segment, when it is rocked, is guided along a line parallel to the axis of the pipe.

4C. In a device of the class described, the combination of a segment member adapted to peripherally engage a pipe, means for rocking said segment member in a plane parallel to the axis of the pipe to draw the same thereabout, and a holding frame adapted to hold the segment in firm engagement with the pipe while the rocking operation is in progress, the axisof rotation of said segment being loi'igitudinally movable with respect to said frame.

In a device of the class described, in combination with a segment member having a curved peripheral portion provided witha pipe-engaging projection at one end thereof and having laterally projecting trunnion portions, a frame member provided with overengaging sides against theunder faces of which said trunnion members slidably engage when the segment is rocked, thereby causing the same to move lengthwise thereof when rocked against length of pipe inserted in said frame.

6. A pipe-bending tool, having, in combination with a pipe-holding portion at one end, a troughed peripheral portion extending therefrom to the other end, adapted to confine a pipe bent thereabout against lateral expansion, means for rotating said tool, and a holding frame lengthwise of which the axis of rotation of said tool is adapted to move in a plane parallel with the floor thereof, to draw a pipe rested on the floor of the frame member about the troughed peripheral portion of the tool.

In testimony whereof, I sign this specification in the presence of two witnesses.

CHARLES S. RYERSON.

IVitnesses IVILLIAM M. SWAN, Jnrrnnson G. THURBER.

Copies of this patent may heobtained for five cents each, by addressing" the Commissioner of Patents. Washington, D. C. 

